package com.ra.util;

import java.util.Random;

public class Ran {
	public String genRan() {
		String str = new String(
				"QAa0bcLdUK2eHfJgTP8XhiFj61DOklNm9nBoI5pGqYVrs3CtSuMZvwWx4yE7zR");
		StringBuffer sb = new StringBuffer();
		Random r = new Random();
		int te = 0;
		for (int i = 1; i <= 4; i++) {
			te = r.nextInt(62);
			sb.append(str.charAt(te));
		}
		return sb.toString();
	}

}
